package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void save(ShoppingCartDTO shoppingCartDTO) {

        //检查购物车中是否存在该商品
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.listByAll(shoppingCart);

        //如果存在则更新数量
        if (shoppingCartList!=null && shoppingCartList.size() > 0) {
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }

        //不存在则新增
        if (shoppingCart.getDishId() != null) { //添加的是菜品
            Dish dish = dishMapper.selectById(shoppingCart.getDishId());
            shoppingCart.setName(dish.getName());
            shoppingCart.setImage(dish.getImage());
            shoppingCart.setAmount(dish.getPrice());
        }else { //添加的是套餐
            Setmeal setmeal = setmealMapper.selectById(shoppingCart.getSetmealId());
            shoppingCart.setName(setmeal.getName());
            shoppingCart.setImage(setmeal.getImage());
            shoppingCart.setAmount(setmeal.getPrice());
        }
        shoppingCart.setNumber(1);
        shoppingCart.setCreateTime(LocalDateTime.now());
        shoppingCartMapper.insertSelective(shoppingCart);
    }

    @Override
    public List<ShoppingCart> listAll() {
        return shoppingCartMapper.listAllByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void clean() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {

        //检查购物车中该商品数量是否为1
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.listByAll(shoppingCart);

        if (shoppingCartList!=null  && shoppingCartList.size() > 0) {
            shoppingCart = shoppingCartList.get(0);
            //如果不是1则商品数量减一
            if (shoppingCart.getNumber() != 1){
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }else {
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }
        }


    }

}
